<p>To enhance the poor pitting corrosion resistance of sintered CrMnFeCoNi high-entropy alloys (HEAs), methods of increasing the Cr content and applying solution treatment to the alloys were employed, and the material characterization and polarization in NaCl solution were investigated. All as-sintered alloys exhibited Cr-rich zones with elevated oxygen, carbon, and manganese concentrations. While increasing the Cr content to 36% in Cr₃₆Mn₁₆Fe₁₆Co₁₆Ni₁₆ led to larger Cr-rich zones and higher matrix Cr content, its corrosion resistance remained comparable to that of Cr₂₀Mn₂₀Fe₂₀Co₂₀Ni₂₀. This limited improvement highlights the need for alternative treatment strategies. Therefore, this study investigated the solution treatment and found that temperatures above 1393&#xa0;K for 3&#xa0;h significantly enhanced the pitting corrosion resistance of Cr₂₀Mn₂₀Fe₂₀Co₂₀Ni₂₀, with the highest pitting potential of 180&#xa0;mV at 1423&#xa0;K, defined at a current density of 100 μA/cm². This improvement was attributed to the diffusion of Cr from the Cr-rich zones into the matrix, which homogenized the Cr distribution. This homogenization is proposed to strengthen the passivity of the matrix and minimize electrochemical discontinuities at the former Cr-rich zone interface, leading to enhanced corrosion resistance. These findings provide insights into the optimization of the pitting corrosion resistance of sintered HEAs through compositional and microstructural control.</p>